Mitsubishi Electric MELSEC iQ-R User Manual page 93

Operation
The logging read function starts after interrupt pointers are set and 'Operating condition setting request' (Y9) is turned on and
off. This function repeats its operation every time data is logged for the amount equivalent to the logging read points monitor
value.
Ex.
The following figure shows the operation when the logging read function is used under the following conditions.
• A/D conversion-enabled channel: CH1
• 'CH1 Logging read points setting value' (Un\G547): 1 (100 points)
'CH1 Current logging read pointer'
(Un\G444, Un\G445)
Logging status
'Interrupt factor detection flag [n]'
(Un\G4 to Un\G19)
'Interrupt factor reset request [n]'
(Un\G156 to Un\G171)
CPU module
(scan execution type program)
CPU module (interrupt program)
(1) The timing when the first interrupt processing occurs
(2) The timing when the second interrupt processing occurs
(3) The timing when the third interrupt processing occurs
(4) The CPU module receives a logging read interrupt and read logging data from the logging read start address for the amount equivalent to the logging read
points setting value.
0
Storing Storing
Logging stopped
data data
0
0
Normal control program
(1)
0
Storing Storing Storing
data data data
1 0 1
1 0
Normal
control
program
Interrupt Interrupt
program program
(2)
(4)
100 200
Storing Storing
data data
0
1 0
Normal
control
program
Interrupt
program
(3)
1 FUNCTIONS
1.14 Normal Logging Function
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